"A mathematician who can only generalise is like a monkey who can only climb up a tree, and a mathematician who can only specialise is like a monkey who can only climb down a tree. In fact neither the up monkey nor the down monkey is a viable creature. A real monkey must find food and escape his enemies and so must be able to incessantly climb up and down. A real mathematician must be able to generalise and specialise."

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In exchange for his first taste of powdered milk, Pascal showed me a tree we could climb to find a bird's nest. After we handled and examined the pink-skinned baby birds, he popped one of them into his mouth like a jujube. It seemed to please him a lot. He offered a baby bird to me, pantomiming that I should eat it. I understood perfectly well what he meant, but I refused. He did not seem disappointed to have to eat the whole brood himself.

— Barbara Kingsolver